利用stm32驱动步进电机的开发程序，STM32系列基于专为要求高性能、低成本、低功耗的嵌入式应用专门设计的ARM Cortex?-M0，M0+，M3, M4和M7内核（ST's product portfolio contains a comprehensive range of microcontrollers, from robust, low-cost 8-bit MCUs up to 32-bit ARM-based Cortex?-M0 and M0+, Cortex?-M3, Cortex?-M4 Flash microcontrollers with a great choice of peripherals. ST has also extended this range to include an ultra-low-power MCU platform)(Stepper motor is an open loop control motor which transforms electrical pulse signal into angular displacement or linear displacement. It is the main executive element in modern digital control system, and is widely applied. In the case of non overloaded, the motor speed and stop position depends only on the pulse frequency and pulse number, regardless of load changes, when the stepper driver receives a pulse signal, it drives stepper motor to set the direction of rotation of a fixed angle, called "step", it is the rotation of the fixed point of the operation step by step. We can control the angular displacement by controlling the number of pulses, so as to achieve the goal of accurate positioning. At the same time, we can control the speed and acceleration of motor rotation by controlling the pulse frequency, so as to achieve the purpose of speed regulation.)